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參數資料
| 型號： | TPA6017A2PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.9 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁數： | 14/29頁 |
| 文件大小： | 575K |
| 代理商： | TPA6017A2PWPRG4 |
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TPA6017A2
SLOS386A NOVEMBER 2001 REVISED APRIL 2007
21
www.ti.com
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
Although the voltages and currents for SE and BTL are sinusoidal in the load, currents from the supply are very
different between SE and BTL configurations. In an SE application, the current waveform is a half-wave rectified
shape, whereas in BTL it is a full-wave rectified waveform. This means RMS conversion factors are different.
Keep in mind that for most of the waveform, both the push and pull transistors are not on at the same time, which
supports the fact that each amplifier in the BTL device only draws current from the supply for half the waveform.
The following equations are the basis for calculating amplifier efficiency.
Efficiency of a BTL amplifier
+
P
L
P
SUP
(5)
Where:
(6)
P
L +
V
L
rms2
R
L
, and V
LRMS +
V
P
2
, therefore, P
L +
V
P
2
2R
L
PL = Power devilered to load
PSUP = Power drawn from power supply
VLRMS = RMS voltage on BTL load
RL = Load resistance
VP = Peak voltage on BTL load
IDDavg = Average current drawn from the
power supply
VDD = Power supply voltage
ηBTL = Efficiency of a BTL amplifier
and PSUP + VDD IDDavg and IDDavg +
1
p
0
V
P
R
L
sin(t) dt
+ 1p
V
P
R
L
[cos(t)]
p
0 +
2V
P
p R
L
Therefore,
P
SUP +
2V
DD
V
P
p R
L
substituting PL and PSUP into equation 7,
Efficiency of a BTL amplifier
+
V
P
2
2R
L
2V
DD VP
p R
L
+
p V
P
4V
DD
V
P +
2P
L
R
L
h
BTL +
p 2P
L
R
L
4V
DD
Where:
Therefore,
Table 2 employs equation 8 to calculate efficiencies for four different output power levels. Note that the efficiency
of the amplifier is quite low for lower power levels and rises sharply as power to the load is increased resulting
in a nearly flat internal power dissipation over the normal operating range. Note that the internal dissipation at
full output power is less than in the half power range. Calculating the efficiency for a specific system is the key
to proper power supply design. For a stereo 1-W audio system with 8-
loads and a 5-V supply, the maximum
draw on the power supply is almost 3.25 W.
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相關代理商/技術參數 |
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| TPA6019A4PWPR | 制造商:Texas Instruments 功能描述:AUDIO AMP 制造商:TI 功能描述:STEREO BTL 1W AUDIO POWER AMPLIFIER |
| TPA6020A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.8-W STEREO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
| TPA6020A2EVM | 功能描述:音頻 IC 開發工具 TPA6020A2 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA6020A2RGW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.8-W STEREO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
| TPA6020A2RGWR | 功能描述:音頻放大器 Stereo Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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